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Aquatic, bright green, filamentous, living (something) growing in a freshwater pond and being eaten by American Coot.
Link to American Coot observation: https://www.inaturalist.org/observations/200660282

Muskgrass (Genus Chara) is a genus of freshwater green algae, called charophytes green algae, in the Stoneworts (Characeae) family.
"They are multicellular and superficially resemble land plants because of stem-like and leaf-like structures. They are found in freshwater, particularly in limestone areas throughout the northern temperate zone, where they grow submerged, attached to the muddy bottom. They prefer less oxygenated and hard water and are not found in waters where mosquito larvae are present. They are covered with calcium carbonate (CaCO3) deposits and are commonly known as stoneworts. Cyanobacteria have been found growing as epiphytes on the surfaces of Chara, where they may be involved in fixing nitrogen, which is important to plant nutrition." https://www.inaturalist.org/taxa/180685-Chara

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NOT

"Zygnemataceae are a family of filamentous or unicellular, uniseriate (unbranched) green algae. The filaments are septated and reproduction is by conjugation; Spirogyra is commonly used in schools to demonstrate this kind of reproduction. The family is notable for its diversely shaped chloroplasts, such as stellate in Zygnema, helical in Spirogyra, and flat in Mougeotia. The Zygnemataceae are cosmopolitan. . . . While they occupy many habitats, in North America all are found solely in freshwater or subaerial habitats. Species typically exist as floating mats in stagnant water in ditches and ponds, but some also grow in moving water, attaching themselves to a substrate by rhizoid-like projections of the basal cells of the filament. The mat species rise to the surface in early spring, grow rapidly through the summer, disappearing by late summer. " https://www.inaturalist.org/taxa/123850-Zygnemataceae

Might it be Spirogyra, Mougeotia, or Zygnema?

On twigs and decomposed granite gravel around base of unknown shrub. At night in granite ravine in desert shrubland. Rained in preceeding days.
Two individuals were observed, though there were likely many more. The coloration effectively made them disappear into the granite soil when not moving.
Apparently an undescribed Prorastriopes species per Frans Janssens:
https://www.collembola.org/taxa/bouridae.htm
https://bugguide.net/node/view/2198249